package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.DishVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * @author Elora
 * @date 2025/6/16
 **/
@Service
public class SetmealServiceImpl implements SetmealService {
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    /**
     * 新增套餐
     * @param setmealDTO
     */
    @Transactional
    @Override
    public void save(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);

        //向套餐表插入1条数据
        setmealMapper.insert(setmeal);

        //获取Insert语句生成的主键值
        Long setmealId = setmeal.getId();

        //获取套餐中包含的菜品的集合
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();

        if (setmealDishes != null &&  setmealDishes.size() > 0){
            setmealDishes.forEach(
                    setmealDish -> setmealDish.setSetmealId(setmealId)
            );
        }
        //向套餐-菜品表插入n条数据
        setmealDishMapper.insertBatch(setmealDishes);
    }


    /**
     * 菜品分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        //使用PageHelper
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());

        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);

        Long total = page.getTotal();
        List<SetmealVO> records = page.getResult();

        return new PageResult(total, records);
    }

    /**
     * 套餐批量删除
     * @param ids
     */
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前套餐集合能否删除--是否存在起售中的套餐？
        for(Long id : ids){
            Setmeal setmeal = setmealMapper.getById(id);

            if(setmeal.getStatus().equals(StatusConstant.ENABLE)){
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        }

        //批量删除套餐
        setmealMapper.deleteByIds(ids);
    }


    /**
     * 修改套餐和对应菜品
     * @param setmealDTO
     */
    @Override
    public void updateWithDish(SetmealDTO setmealDTO) {
        //修改套餐表基本信息
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        setmealMapper.update(setmeal);

        //套餐id
        Long setmealId = setmealDTO.getId();

        //删除原有的菜品数据
        setmealDishMapper.deleteBySetmealId(setmealId);

        //重新插入前端传来的菜品数据
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();

        if(setmealDishes != null && !setmealDishes.isEmpty()){
            setmealDishes.forEach(setmealDish ->
                    setmealDish.setSetmealId(setmealDTO.getId())
            );
            //向套餐-菜品表插入n条数据
            setmealDishMapper.insertBatch(setmealDishes);

        }
    }

    /**
     * 根据id查询套餐及相关菜品
     * @param id
     * @return
     */
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        //根据id查询套餐数据
        Setmeal setmeal = setmealMapper.getById(id);

        //根据套餐id查询对应菜品数据
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

        //将获取到的数据封装到VO中
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 起售停售套餐
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
